Nitrogen recovery of coated fertilizers and influence on peanut seed quality for peanut plants grown in sandy soil

Wen Guang; Mori, T.; Yamamoto, T.; Chikushi, J.; Inoue, M.

Communications in Soil Science and Plant Analysis 32(19/20): 3121-3140

2001


ISSN/ISBN: 0010-3624
DOI: 10.1081/css-120001111
Accession: 003862444

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Abstract
Warm and high precipitation climates in most area of Japan are suitable for growing crops. However, the arable lands are limited. A small scale field experiment was conducted on a sandy soil in the Tottori sand dune to test nitrogen (N)-use efficiency from a regular N fertilizer [ammonium sulfate [(NH4)2SO4]] and a mixture of resin-coated N fertilizers for peanut (Arachis hypogaea L. cv. Hanritusei) production. Nitrogen was applied at 30, 60, 90, and 120 kg N ha(-1) for the regular N, and at 60, 90, and 120 kg N ha(-1) for the mixture of coated N-phosphorus (P)-potassium (K) 80 days, NPK 140 days and ammonium nitrite (NH4NO3) + limestone 120 days, each providing 35, 35, and 30% of N supplied. Sufficient P and K and a micronutrient fertilizer were included. Water was applied through drip irrigation. The seed yields were 81 to 137% higher with the coated N than with the equivalent amounts of regular fertilizer N. Nitrogen recovery rates were 10% to32% for the regular N and 79-94% (average 86%) for the coated N. The high recoveries obtained with the coated N were due to the fact that N release matched crop N uptake and the fertilizer placement (beneath the seeds) allowed for immediate uptake. A highly effective N fertilization management program for crop production on this sandy soil is possible. A carbon (C):N ratio of 16.9 and 13.4 in the seeds was found with the regular N and the high rates of coated N treatments, respectively, indicating the seed quality was significantly affected by N application from the different sources.